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[QUOTE=Justus]Jason Finnie's Tac (Pic pulled from MCB) has a picatinny rail on the bottom:

Yes it was that picture that made me think about it.
Not just a attached picatinny rail,but a mount milled in the mag rail
With so many different custom rails out there i think it's strange that it hasn't been done as far as i know.
There i more than 2 inches in front of the frame on a E-mag rail so there is room for it, and i thought it would look really good with a tac-one body.

Jason Finnie's Tac (Pic pulled from MCB) has a picatinny rail on the bottom:

Hey guys, yeah that's my mag. Luke actually made that rail extension for me. I sent him a drawing, some rough specs, a sample of a picatinny rail, and the grips. Not long afterwards I had this nice foregrip.

Works awesome. Much more comfortable for me as i can move the grip to or fro depending on how I feel. I have 2 different grips I switch between, and I can slide the grip back to mount lights or stuff in the front.

If you were to design a new rail with this in mind, I would make it similar to the longbow-ready tac rail, so it is the same length of the standard tac-one body and add the picatiny rail stuff to it.

As far as the side milling is concerned, I'd say just make it look like it should be on a tac-one. I was thinking it would be neat to add side picatiny rail pieces to the rail with that hug the body in front of the feedneck, but that would get expensive with all the material you'd have to cut out for something like that.

The rail in this picture is similar to what I had in mind for a new tac rail. The only changes I would make to this rail would be the front would line up flush with the front of the body, without that angle cut out of it. Of course the addition of the picatiny rail on the under-side of the front of the rail, too.

Ive seen a few tacs where they mounted a rail in front, might be easier to go that route, plus you'd get to choose the length of the rail to mount.

I'm one of those who mounted a rail on the front. I then have a quick release/adjustable tactical fore-grip attached instead of the bicycle grip. Mine's a rather long rail and doesn't sit flush the front of the gun. It pokes out quite a ways and has that odd gap between the rail and the barrel for a few inches.

I'm actually thinking it would be nice to sink the picatinny rail into the rail, so it sits closer to the body. Then, we could have a flat piece that slides over the picatinny rail and is secured by the (RT-style) foregrip mount screws, so it sits flush with the rest of the rail. This way, you could switch between picatinny and standard foregrip if you wanted to. I'm attempting to draw it up in eMachineShop's "CAD" program, but it's taking me a while to draw the cuts and get them right.

I'm actually thinking it would be nice to sink the picatinny rail into the rail, so it sits closer to the body. Then, we could have a flat piece that slides over the picatinny rail and is secured by the (RT-style) foregrip mount screws, so it sits flush with the rest of the rail. This way, you could switch between picatinny and standard foregrip if you wanted to. I'm attempting to draw it up in eMachineShop's "CAD" program, but it's taking me a while to draw the cuts and get them right.

Canít see what youíre saying. Literally.

Iíve never used eMachineShopís ďCADĒ program (looks like itís a solid modeler), but it took me like a minute to find and download the parametric picatinny OpenSCAD file from thingiverse, set it to 5 segments or whatever, render it, import it into Sketchup and slap it onto my rail.